[PATCH v2 0/3] HID: i2c-hid: Probe and wake device with HID descriptor fetch

From: Kenny Levinsen
Date: Tue Apr 23 2024 - 08:26:17 EST


This revises my previous patch[0] to add the sleep STM chips seem to
require as per discussion on the original patch from Lukasz and
Radoslaw[1]. I had initially tried without as it had not previously been
needed in the similar logic in our resume path, but it would appear that
this was simply luck as the affected device was woken up in that case by
"noise" from other sources.

To reiterate, the idea is to add the retry that Lukasz and Radoslaw
discovered was necessary, but do away with the dummy smbus probe and
instead just let HID descriptor fetch retry as needed, aligning more
with the existing retry logic used after resume while saving some noise
on the bus and speeding up initialization a tiny bit.

I added Co-developed-by tags, I hope that's appropriate. We should await
an ACK from Lukasz on it fixing their hardware quirk.

[0]: https://lore.kernel.org/all/20240415170517.18780-1-kl@xxxxxx/
[1]: https://lore.kernel.org/all/CAE5UKNqPA4SnnXyaB7Hwk0kcKMMQ_DUuxogDphnnvSGP8g1nAQ@xxxxxxxxxxxxxx/